A36）．．．．x:y3:2）xy5xy1x2x14．．．．y2y3y3y13RtCb，，c4B）1．3．1．4．43x422y）4x4,24y隨xDx)4931．．．．25251010D、EAB、ADE）6543//AC//，AEBDAODEABCD、BDO，DE）11yxy隨x32109%漲a）1a%1a%．2．D．212a%12a%．22CABAPB（（）O．4．．．311.＝2yxmnmn12.13.mn、x22x30．，ABCD、BDO，．14.C5與ADB=4，AB，AD，，．為6tan4512201904sin602x3x102x22xyy2xyx2y31x，y5x4xy5x4yx210沿xABC.C1111B2AA.222210A22AB42AB處CDDABA樓ABB.已知DmAB3)，，A4,aB10,4，mxykxbyCxSyPSPAOPAOC20.，O是、、與交DOFBAG.是OO3ADB4若x2xax2bx80（a0ab是.22.xa2x22a3xa10有兩個不相等的實數(shù)根，則a.是k、Fyx在x3kA、ES.OAE5mx4xnPPm,n21yP與x2.yx2x3AByCx、x2點DP為yPD.32x.yx4，BP作APAB，P是于E于.FP交AB于AE，PE交GHPFPHAEAHABAP2A1,0，yax2ca（0AByCx、C0,2點.（2）點PABP作PD//AC交PM的MA卷165x321832y21231232a2b3c1，，34210∴2322∴x33x1，x∴442xy225x4yxyx5x4yxyxxyx2yxx1x3，y1時當(dāng)x13.4,116412S，ABC22212310025∴PABD作DEE，則在，，BE3BDEtan303m.∵tanDEADE在，AEAEADEtan423m∵tan0.9，DE12318.68m∴.ABm.xD，DB10,4，∵∴kxy，BB40y；xx410a.當(dāng)y4,10ykxb∴A4kb10k1∴10kb4b6，yx6；C6,0yx6y0x6∴6，SSS∴AOBBOCAOC11OCBDOCy22A16410242P0,n11OPx|n|42|n|則S∵SAOPAOC2A2121OCy61030，2A∴2|n30nP0,15P0,151∴或2AF∵BF為O，，∴∴∵∵，∴∴.∴是O，則，∴∴AO//CFADODCDDF，7DF1，，3AD13CDAD∴CD31AD27，7∴321∴ADDCO.26，∴ADCDAD62122，2343，，∴1436123∴S；ABC2∵442BC，交，MMO22AM422，142422828∴S.ABC2B卷1783a且a21035x30200105x350；）y2w.則wx205x3505x450x70025x2535015x∵x2030∴x50x，∵wxxB知∴，故F在而FPAFFPAPF，而FPAHPHA，又PHPFPH∴PAA作于M，，AB4BMMP2∵∴CM22AM22，APE25AHABPAB得PAHAP2APHABPBF∴AB4PC424∴BPF∵∴CPCGCA∴21282828∴CG∴AG1,0C0,2，A12，∴∵OAOB∴由射影定理可得：OC2，B4,04∴12ax1x40,2yya.13xx22.22P作y于E，1x2設(shè)Pm，,0l：y2BC∴Em,1m2y2x2：l2ACP,0y2xbbml：PD4m41xx2y4m482m582m52∴D5,52x2myy4m45111115S|xxm2m4m1222DC4133P,02mS22M3,2當(dāng)當(dāng)CM//ABM作于FF作yxG，MxKG,01Fn,n2設(shè)2MKFGCO1MKMF1，F(xiàn)KBGBO2FKFB2141n1，n2∴KM23131,n4yxx2∴Mn42，2285nn4M,9393,25M,故M或391x2設(shè)Pm，,0l：y2BC∴Em,1m2y2x2：l2ACP,0y2xbbml：PD4m41xx2y4m482m582m52∴D5,52x2myy4m45111115S|xxm2m4m1222DC4133P,02mS22M3,2當(dāng)當(dāng)CM//ABM作于FF作yxG，MxKG,01Fn,n2設(shè)2MKFGCO1MKMF1，F(xiàn)KBGBO2FKFB2141n1，n2∴KM23131,n4yxx2∴Mn42，2285nn4M,9393,25M,故M或391x2設(shè)Pm，,0l：y2BC∴Em,1m2y2x2：l2ACP,0y2xbbml：PD4m41xx2y4m482m582m52∴D5,52x2myy4m45111115S|xxm2m4m1222DC4133P,02mS22M3,2當(dāng)當(dāng)CM//ABM作于FF作